ARMY TM 9-2815-254-24
AIR FORCE TO 3861-94-2
FIGURE 3-66. Valve Stem and Guide Clearance
(3) If measured values exceed specified limit, valve and valve guide must be replaced as a set.
(4) Intake valve stem clearance standard is 0.0015 to 0.0027 in. (0.039 to 0.069 mm), with a limit of 0.008
in. (0.20 mm). Exhaust valve stem clearance standard is 0.0025 to 0.0037 in. (0.084 to 0.093 mm), with
a limit of 0.0098 in. (0.25 mm).
Check valve stem outside diameter as follows:
(1) Using a micrometer, measure valve stem OD at three points, refer to FIGURE 3-67.
FIGURE 3-67. Valve Stem Outside Diameter